团购类网站倒计时的js实现

/* * 倒计时的实现*/
var fnTimeCountDown = function(d, o){
	var f = {
		zero: function(n){
			var n = parseInt(n, 10);
			if(n > 0){
				if(n <= 9){
					n = "0" + n;	
				}
				return String(n);
			}else{
				return "00";	
			}
		},
		dv: function(){
			d = d || Date.UTC(2050, 0, 1); //如果未定义时间，则我们设定倒计时日期是2050年1月1日
			var future = new Date(d), now = new Date();
			//现在将来秒差值
			var dur = Math.round((future.getTime() - now.getTime()) / 1000) + future.getTimezoneOffset() * 60, pms = {
				sec: "00",
				mini: "00",
				hour: "00",
				day: "00",
				month: "00",
				year: "0"
			};
			if(dur > 0){
				pms.sec = f.zero(dur % 60);
				pms.mini = Math.floor((dur / 60)) > 0? f.zero(Math.floor((dur / 60)) % 60) : "00";
				pms.hour = Math.floor((dur / 3600)) > 0? f.zero(Math.floor((dur / 3600)) % 24) : "00";
				pms.day = Math.floor((dur / 86400)) > 0? f.zero(Math.floor((dur / 86400)) % 30) : "00";
				//月份，以实际平均每月秒数计算
				pms.month = Math.floor((dur / 2629744)) > 0? f.zero(Math.floor((dur / 2629744)) % 12) : "00";
				//年份，按按回归年365天5时48分46秒算
				pms.year = Math.floor((dur / 31556926)) > 0? Math.floor((dur / 31556926)) : "0";
			}
			return pms;
		},
		ui: function(){
			if(o.sec){
				o.sec.innerHTML = f.dv().sec;
			}
			if(o.mini){
				o.mini.innerHTML = f.dv().mini;
			}
			if(o.hour){
				o.hour.innerHTML = f.dv().hour;
			}
			if(o.day){
				o.day.innerHTML = f.dv().day;
			}
			if(o.month){
				o.month.innerHTML = f.dv().month;
			}
			if(o.year){
				o.year.innerHTML = f.dv().year;
			}
			setTimeout(f.ui, 1000);
		}
	};	
	f.ui();
};

<script type="text/javascript" src="../js/timeCountDown.js"></script>
<script type="text/javascript">
var zxx = {
    $: function(id){
        return document.getElementById(id);    
    },
    futureDate: Date.UTC(2050, 6, 30, 12),
    obj: function(){
        return {
            sec: zxx.$("sec"),
            mini: zxx.$("mini"),
            hour: zxx.$("hour"),
            day: zxx.$("day"),
            month: zxx.$("month"),
            year: zxx.$("year")
        }
    }
};
fnTimeCountDown(zxx.futureDate, zxx.obj());
</script>